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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16581ab05db48432b3ff0b7669d0083874c7a272b4763116812ced46b8286aca' 
  AND token = '3ysr8vRgisxy6jCU2a16dc3nGWhLo5dq91hf21A1YS4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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