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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a731167fed0a2c27bfb79249ff3e95f7956f33f016d2832bfbdd05ae0310a2c6' 
  AND token = 'oqJM3CT4bECLHhBNslGxw/kiEsfIS+2eNaUcDS2c8aw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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