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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '946741ef1aa4ac86da2a91989aa511e731a91fb99d696ba5d091ef3ed1f8e918' 
  AND token = '9r/93Vemj0EbGBU+Tq5CX55qjVzmR9ASEFMMBo59Ehc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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