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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbd7f35566d352632919d3971a1b509e8ab798595c2d4ae4fa3deaaa8c60801d' 
  AND token = 'd+p2TSl5pYPhE2sEazQWao4egGgHjAMTSxgLjMimW3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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