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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af4fa29a45618f5c3eeb33e1bdf5aa3877f71f796dcd83c5a176dea7d17a3843' 
  AND token = 'J92JIf/rro+8R/hBl6dk7HWbMMArlZ5J5+G3rgekX+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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