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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40b595ae5138df4b59c8633f67b6f8577297169ba939eb9c4f7be8384e8e2110' 
  AND token = 'WF2QMKjxP7PIT6IDP+QKa4ZcP7izXPgSjNNqvTlu8M4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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