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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41d52e062e117351247b1ab09bbb0b9e6009012639d26620c82fe60bc897a33e' 
  AND token = 'mpYKT54sI7FJ4epOH2SLDFJsaJ/CdDiQlgaoC2+n4GU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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