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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adfec7d51f1d8584bf9bccfd0d09f35a197a62018dbf232c97f07d10bdffe5bb' 
  AND token = '0L2JIoPJ5i2ZdeJrh/le8GcPl3ug/142zff78WUgqgY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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