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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bc4fcaeb7c2d862b167fd3eecb71b261718fe7a9936770ec31552d2a329add0' 
  AND token = 'ec297zZS5KP8q/grCoJvPhMDkUez9KHcMoi3ieUs9HQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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