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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b50da2486c97e3307073065b3ff3656e8f1aa99fc0391e1c04f39537934976d' 
  AND token = '1sYoPBxuDbLB9QwNRzciC3bcFnKq+CIbiIL0bdPjJZ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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