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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da977e65443df561c460855394bb53dec8c00d1c65a895a0eb2c6e746f0e405e' 
  AND token = '29Lt81vUulX2jqYc6VMS1DrJs2QV41Juzv2UjEk8mAE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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