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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7cf084b6b375b6c19ea7ca216a69100cb7edb039cc9c316ef3480c397130b6d' 
  AND token = '4uSMLk5fttfZ5rcKuVNFcWW7dAQW41mit8Hi3mLacFs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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