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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0f50cefefab8c93f728f4659b22a54271e510d27a2584cdd1f713ac695474cc' 
  AND token = 'bakNgxZCpNaXkQiAJS+H3vAovCsGl0HOD92c4VgrovM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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