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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8e4dc5dafd62dd0d920fe9b2d2341ba05f011f31738bb7bb1216879a107f90e' 
  AND token = 'V5Gsz5G0kn5YPiCAvQj+41nilJfjjGk7mgJ98VidP9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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