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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76bca8b8a7387bcc3a86d43acaa024accd97d207150a75ebcc884ed25d185735' 
  AND token = 'lk1Kq7/67jqpp2c30EI81nWO5RJDz11j+xNDaMd+aB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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