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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27b88739263231b017048485a4a973a808bd3d52a3e2f7aa2ea1b30d49b3dbbb' 
  AND token = '/lDyObXhgIW+QzxQSX8+krET+H8n5sioP/hAw49oLkc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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