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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6084d02f1072691c5f2efa6c166415ac6cb4245a77e90b3305cecf380b53d071' 
  AND token = '6aHksxqH0vzh2z199Wt8iX3VGbPmHRv6krt4R2TDSTY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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