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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04a791c2b2c91e63382cb07668103d40d6d9a0f5811032ab2b95202d5cd9c5ad' 
  AND token = 'T2/2Cu6JDBds8NM1FdALK8LuooHCwd673D7ZBJAsgRA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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