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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da034accd9aa6bc03e6af35c3fc0e3f8506504d25586ade5990b79d263a52b18' 
  AND token = 'CXamin6PkdXozlqXTcwJHHw7eYBkyJKptDmdd7+tRq8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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