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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20941890227ea4565d83906fa463daef44b2fae696a763c298c10e0736a10a48' 
  AND token = 'dwd92AlPDnxdPK0ThovPaEb/yqIr9ZGgPwk+a3coAYs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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