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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd457ec71b642e23bbe38cad85ff4ff926e4e55be0480a015e6dd78a0178e7ae' 
  AND token = '39Smai8a8CNKPNa+2jIWjWO7cv1xVG2RQqkeWmWngP4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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