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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '513646a94cd4cb334e153db2936ab1113206b7927f4148ce0b33ebe10fe671c4' 
  AND token = '+qietFbRJsCdjM1jK5KVkmGwf8h3JY4RgZZrAgy5UaE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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