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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0d148e45bcf7787c9fb06e4f0dfaf1dc35f6585390e6bde635ca481e72bb007' 
  AND token = 'YyUcfFb8nfH4IgPpntDpGw8nnaJYel4m79h2vgjpeng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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