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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52fb41a9ab0d43c3e32ca3c54742b2136c03a9dfa2e092dd93b0cbcab875e57e' 
  AND token = 'Dbp6jQtKXYcVJM85IKYfZokbtjFfq0dHSqu3hj+zgzA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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