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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56009b9e181f8283f2fe0253d1c2dd2045e1f323eb482c6d32307ac297ae7029' 
  AND token = 'yOzAVkv9qRHh37RfqumNDrxNLx0Y0aD7sddxi5MjKsA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}