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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06efb15be76a754892c7d65d3323fefb1d4191e9ee1fc3366bde5d3d08966f84' 
  AND token = 'uQvK66ke3dPi7USuPIEUzuS3uce/zVsWTFAaDhsnA9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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