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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd98e4f4e342dc6ab8f7b86e6e2b0fa13629aad81081a9cda118857faea6a52f2' 
  AND token = 'cjJTBrQB7bl/4vFBWDuIFE99u8F22K10DQCQYGXFXbI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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