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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f993c4b2b4e4926e48bdd1c59958c816887c093832d32b4840af09557f189976' 
  AND token = '2K0tyTcMI0lci34yNLq/Vbm+gbf0q0TA7RQ2zrWHvBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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