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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a73a5d90ded878f6d756023403c56dc67963a55082d08d2fa970a4d17b2c9b4' 
  AND token = 'Agand6w95p8eU97F7uLJYce4rDfK8+eFZ7uTmO2PVCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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