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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b004adb4e06211c4883084b0b566fb91632f3306b8689c159be6a1155e3e7598' 
  AND token = 'qbRgf7U3G46wCJal+ZQeO/QGarEH1KQvgn1H62AkqmQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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