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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1adedc091b523df5afc6c12028c8b3be73d4ce150d21797a26ebe73eb5746cd' 
  AND token = 'VHH7SVVB2SGHii/GbNGMiJLWDx68yIOTKu1CwvQMskc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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