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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb7282ea681901708bae99f725a330cdce2777d2ac315fb4fe07f1f536ae60e4' 
  AND token = 'BKVJqJ0NNHuEibXdsH2aeOwYxzoVdA0VZQ/GXrry8og=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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