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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6e5e2e637930ffc86d061c436d60610b47467f06550f089b44cf0e7f1c231e7' 
  AND token = 'eBa5BbTVd0a9qplj8qZkiI2WiDqugrusKqB6HQMm0cU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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