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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d6eabaf0edf8df8a26569ca72af0fe3ca75a9c048796ea311c1aa1107216e60' 
  AND token = 'LmGWIZmvyabnFmK5NJP5vmgCOgBqWc965z1tF90AeXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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