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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c586076308e93c7f87d0158fc3aa9af362bb3229344baf6b7021b02d3412a3a7' 
  AND token = 'Q7bJJvHnGqehzjRxMGm6WDmVI5m9eRbQmG9VrQgai7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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