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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '903652a3eae01c6f082dd94b0167542b78ed0bd792a21f1756d999e9a1528c2e' 
  AND token = 'nLRNjGJiWejMX5Sf+aO3RS+WP950l92ZjMmY22M28iI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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