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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b56d622feca536607d1baf7fbab2c77230d4b68684b8edaba1082e1967c650b' 
  AND token = 'ap3DpNMjbwKDGs+yalhVjIpy06cY3hf/72vy+uNknDA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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