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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '498b0bd6e15369bc8b550dd2e72ae7f72f079e95a3812c384349c3f20acce742' 
  AND token = 'n43R4VYJKLKsUv34aVf6dEmZ6wLFmQGs3PKrdVDYV4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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