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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9451c6865a1e5fa549c6771e61cfa09dd4498360ebfa5fc15623d5e0642bfe3' 
  AND token = 'kbDFpAr1ek4LW100MBjzfeWsa0cjrEp6Qw8Xd2qaltI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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