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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df574ec97ba8b9ef0e50d1f8ee5eaf4125f30ee5a9a70a84100237ba5be0e377' 
  AND token = 'XqlwVcCN7zrUn0Wgnh7AyrqswIlJb9hKHmpLLKuy9/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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