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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9d91d2b1ed9fe150d1a4875fd79a762a7d1e46a8f4aefc36f44e19a08fa32db' 
  AND token = 'rLq0GDCsiGKMxVF2+db2c4mE5eNsW2oWENQ1gZCys3A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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