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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f30737186ce4268b681a7e80379ab2877016eebb854454bb52f4bd1e086b8d19' 
  AND token = '9eORo4Ot7zko4ufjRbTlDKp0t1NZuX42ulAqXHb+of0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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