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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12c72e0dcf9abbad97e63799d9f76c343a5c305a77c25fe1e66c495a2b37a606' 
  AND token = 'HFfcYouTkKHBJ6HTXrF3aQdutgE29JLd8/5YldAQYq8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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