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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ce44f393b677639df5ea96afb41a7d7574a858ae36e47b7e99ebacbfb34d075' 
  AND token = 'lDBvVd8iG/Iiv2G9fqn2QI9fLDwq6/afGUjUs4R2ETk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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