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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5f01b899871a85bb8ee2b2ade2506a5128325f9ba735acb0956909e2719c86e' 
  AND token = '5/RbbNyCZqibflr9tPZeK6hiSJCG0ityKOA+MSRZxOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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