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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acbdba34bff0697382b6ff616887eaa83cec2dd18d875a5eee1495f392a9ae7d' 
  AND token = 'LJVRSY3gOjpktgN91KQuE6qxUIIjU1uf4wLEj4SG7Ow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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