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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a755ed05b665534e9a6b1e133c06b2ee50ccadd45b866462ffbf95d9214db2de' 
  AND token = 'BVmYg+0B37zipav4IqbwB5HEfpt89tdReDsVjd/h4jE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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