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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10206e157b12fed06c968c3b851d10e0a36dfdafe67337c3d4e839855b1eb784' 
  AND token = 'mGgVcCRd/ubaATJL0pIRNJS3ZOiHl6R3U9AehcvKwMo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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