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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90f35c70372f15dee90a116e0b26a8c28fd42945440a5124762c5eb54d8f25ad' 
  AND token = 'eMem1UxTX/u2iDiX/C/U0fDcdDCVXha+0RdD+6SxY3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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