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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a124fac83779f67c7c97286c3bd82886d40fd5f4a4aa4f49513826d647e25804' 
  AND token = '7ebEY62tn4usLysLXduwqycDS1gTgwzfZTFnccbXxgc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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