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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4b5e42ac0c487f47e30a5c5f1a14ce3d95772371fc4b2fd938f6c4f2883f89f' 
  AND token = '9K4izMDmNloFu41eGbdRwN/89I8cmpwidf1fS7N/bEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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