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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be184edd63a16a4730d40d649f0b8b83e4daf3f661bea5e6f6f9ed3556751fbb' 
  AND token = 'iR2TDf+rL5ZSPu/ZjmyE3au6xDxv2LPWXI5+M82vsyw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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