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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd077be9e391c57f43f5a9a9c6ecc52763a637fe2256ab3eb9fb378b3e440ebfc' 
  AND token = 'JSfhPK62LckJsWbBKUYAtPQpkP42upN1lG65dT0Vz1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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