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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6690f502ffbceb860ba5b025a9a8240b2eccb59c5c89dea8fcbdca123561b708' 
  AND token = 'O7A1+y8NOGCdgicEej0/ht0i6Nneb4t2hZYVO3HT8NA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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