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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc8159380c118b74893a05897c19b9e4de92e2747fbf711eaa0fc27dcaf36b8a' 
  AND token = 'bMMW+HFhbfrl/Q5MkOzrbWIxnb+jOpZqANk18rUJpqc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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