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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '782522eae5e8aea1bd8df34d567f2187c964234e246167bca24282096b781699' 
  AND token = 'kjsiGgO7ty1xb+ZH/bmrIYmb1jhqh0J9y6b9/Pph5hs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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