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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04c1dee36e40bd67d4f822dd2c08f0e8ccd5bda27c968c9f2816ff054459a49c' 
  AND token = 'RMXbxOHPmC4dA83H2K78LIcrGc4fhN8eOqLwmQX9Gfk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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