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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e7f0d43c796d8270acdec41b0123219196d220f1223af71d1eb3db5a270cbd1' 
  AND token = 'lD/o8t3YjuHHuhF8K1AvCuodqW0NX8nJchx86i6R0wY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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