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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e7b08e52537733f5e7cf7897b0f8799edcb144110249ddc5583e9f288c811e1' 
  AND token = 'ee6sn2VcrFVHUm2ksS57WfHz20lssf2F9InEL1QhzOE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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