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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5be42eec993eabb46d626b6b2e5843b853b05b70a731f093f950394b5f1e49cc' 
  AND token = '2eIm/Bb1UI260aUdsWIRUZZqccqATB8iF6drFb68zuY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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