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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53cd688e70634ed4b65ee4c5fdd4c6eea0d9df9da71d80476604032537c57ff4' 
  AND token = 'q5U88w44W6UOAgdnIAQYWS/wWUehp0iiy2LVu6XGzNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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