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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cd138b2a1b31ddefc652ddf218bef3d87139cc59454feedbafd26dd102b4959' 
  AND token = '8A+qhnadVGrsF0VaubnHev9xon56xM8kPfiafQNK2SQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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